As far as I know the clips simply keep the pads from making noise. Look closely at what part of the pad they interact with when installed... I think you'll find that they really don't do a whole lot. But, I am no engineer ;) I didn't have them on my car and everything worked as it should.
If you want to run the 3mm spacers, I do recommend Turner's hub extenders.
Shameless self promotion:
If you want to run the 3mm spacers, I do recommend Turner's hub extenders.
Shameless self promotion:
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